Polar

Polar Po"lar, a. [Cf. F. polaire. See {Pole} of the earth.]
1. Of or pertaining to one of the poles of the earth, or of a
sphere; situated near, or proceeding from, one of the
poles; as, polar regions; polar seas; polar winds.
[1913 Webster]

{Polar bear} (Zo["o]l.), a large bear ({Ursus maritimus} syn.
{Thalarctos maritimus}) inhabiting the arctic regions. It
sometimes measures nearly nine feet in length and weighs
1,600 pounds. It is partiallyamphibious, very powerful,
and the most carnivorous of all the bears. The fur is
white, tinged with yellow. Called also {White bear}. See
{Bear}.

{Polar body}, {Polar cell}, or {Polar globule} (Biol.), a
minute cell which separates by karyokinesis from the ovum
during its maturation. In the maturation of ordinary ova
two polar bodies are formed, but in parthogenetic ova only
one. The first polar body formed is usually larger than
the second one, and often divides into two after its
separation from the ovum. Each of the polar bodies removes
maternalchromatin from the ovum to make room for the
chromatin of the fertilizing spermatozo["o]n; but their
functions are not fully understood.

{Polar opposition}, or {Polaric opposition} or {Polar
contrast} or {Polaric contrast} (Logic), an opposition or
contrast made by the existence of two opposite conceptions
which are the extremes in a species, as white and black in
colors; hence, as great an opposition or contrast as
possible.

{Polar projection}. See under {Projection}.

{Polar spherical triangle} (Spherics), a spherical triangle
whose three angular points are poles of the sides of a
given triangle. See 4th {Pole}, 2.

См. также в других словарях:

Polar — Po lar, a. [Cf. F. polaire. See {Pole} of the earth.] 1. Of or pertaining to one of the poles of the earth, or of a sphere; situated near, or proceeding from, one of the poles; as, polar regions; polar seas; polar winds. [1913 Webster] 2. Of or… … The Collaborative International Dictionary of English

Polar — Po lar, n. (Conic Sections) The right line drawn through the two points of contact of the two tangents drawn from a given point to a given conic section. The given point is called the pole of the line. If the given point lies within the curve so… … The Collaborative International Dictionary of English